HAMILTON, MODEL 23, CONVERTED PILOT'S
SINGLE-BUTTON CHRONOGRAPH BLACK DIAL
Hamilton, case No. 443461, Model 23. Made circa 1940.
Fine and rare, large, stainless steel wristwatch with
single-button chronograph and register.
Three-body, polished, inclined bezel, concave lugs,
co-axial button in the crown for the start/stop and return-
to-zero functions of the chronograph, screw-down
caseback with military inscription.
Black with luminous Arabic numerals, outer minutes
and fifths of a second divisions, subsidiary seconds and
30-minute registers. Luminous white hands.
Cal. P58, rhodium plated, 19 jewels, straight-line
lever escapement, cut monometallic compensation
balance, Breguet balance spring, index regulator.